Improvement in furnaces for tempering castings



, Furnaces for Tempering Castings, &c. N0. Ulf.y Patented Oct.7,1873.

WuTNEssEs; Figa. INVENTQR.

\ 2 Sheets--Sheet 2.

"W. M. WATSON. Furnaces for iTemperingV Castings, &c. ,N0-l 143548'. yVPatented 0m. 7,1873,

WITNESSES. f INVENTQR.

i 4 @627% y A /ffMW/amwf UNITED STATES nTnNT u WILLIAMM. WATSON, OFTONIGA, ILLINOIS.

IMPROVEMENT IN FURNACES Fon TEMPERINGCA'STINGS', ae.

Specification forming part of Letters Patent No. 143,548, dated October7, 1873; application filed v August 9, 1873.

To all whom it may concern:

Be it known that I, WILLIAM M. WATsoN,

of Tonica, in the county of La Salle and StateV of Illinois, haveinvented a new and valuable Improvement in Furnaces; and I do herebydeclare that the following is a full, clear, and exact description ofthe construction and operation of the same, reference being had to theannexed drawings making a part of this speciiication, and to the lettersand gures of reference marked thereon.

Figure l of the drawings is a representation of a bottom view of the tophalf of my furnace. Fig. 2 is a top view of the bottom half of the same.Fig. 3 is a sectional view, and Figs. 4 and 5 are details, of the same.

This invention relates to certain novel improvements, which areespecially applicable to the furnace for tempering castings, for whichLetters Patent of the United States were granted to me on the 6th day ofFebruary, 187 2. 'My improvement relates to the introduction of eitherair or steam into the combustionspace for the twofold purpose ofpromoting combustion and increasing the draft of the furnace; also, to anew mode of packing the space around the turn-table to prevent theintroduction of air through such space into the furnacechamber 5 also,to an overhanging wall or deiiecting ridge which will direct the heatedproducts downwardly upon the turn-table; also, to a new and simplemethod of regulating the escape of the product of` combustion by apeculiar arrangement of brick passages leading into the main flue of thefurnace, in combination with movable closing-bricks, whereby any one ormore of the said passages can be partially or wholly closed at pleasureby means of said movable bricks.

In the accompanying drawings, A represents the ash-pit, into which airis admitted through a pipe, a, or in any other suitable manner. B is thehre-chamber, and O a bridge-wall, the upper portion of which isremovable for the purpose of substituting a new part when the old burnsout. Directly above the fire-chamber B is a coil of perforated pipe, D,which admits jets of air into the flame-space from without for thepurpose of supplying oxygen freely utilize the heat by preventing aconsiderable quantity of it from escaping over the castings withoutbeing brought into contact with them. The said bridge-wall b is arrangeddirectly over the front part of a horizontally-rotating hearth-table, G,on which the castings to be tempered are placed, and with which accesscan be had by means of an opening, which is closed by agallows-suspended gate, c. The

hearth-table G is sustained upon the upper end of a vertical shaft, G',which is stepped in a block, g, in a chamber, H, and which may berotated by means shown in the drawings, or in any other suitable manner.Around the circular hearth-table G is a flange, e, which dips down intoan annular pan, J, which pan is fixed to the wall surrounding chamber H,and receives ashes that cover the lower part ofthe said ange c, and thusmake an ashpacking that prevents air from below entering thetempering-chamber above. This feature of my invention is clearly shownby Fig. 3, which represents the annular table-iiange e dipping down intothe annular ash-pan J.

After the products of combustion pass over the hearth-table G theyescape into the chimneyiiue K through a number of longitudinal channels,f, which are formed by brick partitions L h, arranged from side to sideof the reverberating chamber E, and supported upon the stationary partof the hearth at the contracted outlet of this reverberating chamber.There are two courses of brick in each partition h, and the courses areso arranged that a halfbrick is left exposed in each course in front, asshown in Figs. 2, 3, 4, and 5. The exposed e p Mams half-bricks aredesigned to afford elevated supports for supplemental movable briclisj,which will close the upper half of the spaces between all or any numberof the partitions7 asmay be required.

If it is desired to still farther check the draft of the furnace, thelower half of any desired number of thepartitions may be closed by othermovable bricks7 j. as represented in Figs. 4 and 5. In this way7 and bythese simple means, an equable distribution of heat over the rotarytempering-table is always maintained. At the same time the draft can beregulated to a nicety.

I am aware that the broad idea of introducing` jets of air or steam intofurnace-chambers is not new; and I do not claim such contrivance whenconsidered alone.

What I claim as new, and desire to secure by Letters Patent,'is-

1. The combination of the or steam jet pipe or nozzle D with theiire-chamber B, reverberatory chamber E, and rotary tempering or hearthtable Gr, substantially as described.

Q.V The annular ash-pan J, combined with the annular flange e and therotary table G, substantially as described.

3. In a furnace for tempering castings, the reverberating chamber E,having an overhang ing wall or deflecting bridge7 b, which will directthe heated products downwardly upon the castings on the turn-table7substantially as described.

In testimony that I claim the above I have hereunto subscribed my nainein the presence of two witnesses.

WILLIAM MEDD WATSON.

Witnesses ELIAS W. Woon7 G. G. PRATT.

